交 KOU, maji(ru), kawa(su) - mix
示+申 JI, SHI, shi(mesu) - show / SHIN, mou(su) - say, be named
兒 GE, NI, GEI, JI, ko, chigo - child
若 JAKU, waka(i), moshikuwa - young, or
毛 MOU, ke - hair, fur
They all take the "fish" radical (魚 GYO, sakana, uo - fish) to become other characters.
鮫 same - shark
鰰 hatahata - sandfish
鯢 sanshouuo - salamander, female whale
鰙 haya, wakasagi - smelt, はや
魹 todo - sealion